Reducing nanoparticles in metal ablation plumes produced by two delayed short laser pulses

Noël, Sylvie; Hermann, Jörg
February 2009
Applied Physics Letters;2/2/2009, Vol. 94 Issue 5, pN.PAG
Academic Journal
Using fast imaging and atomic force microscopy, we demonstrate that the fraction of nanoparticles in ablation plumes produced by short pulse laser irradiation of metals is strongly altered when a second laser pulse of sufficiently large delay is applied. Comparing the results obtained for gold and copper, it is shown that a significant nanoparticle reduction is only observed if the delay between both laser pulses exceeds the characteristic time of electron-lattice thermalization. We propose the reduced electronic heat transport at large lattice temperature as the dominant mechanisms for the observed nanoparticle reduction.


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